September weather forecastCastleton, Jamaica
September
Weather in September
The first month of the autumn, September, is still a hot month in Castleton, Jamaica, with temperature in the range of an average high of 31.4°C (88.5°F) and an average low of 23.3°C (73.9°F).Temperature
Shifting into September, Castleton records an average high-temperature of a still hot 31.4°C (88.5°F), presenting minor fluctuations compared to the previous month. Castleton's average low-temperature is measured at a warm 23.3°C (73.9°F) during September.Heat index
For most parts of September, the heat index is computed to be an extremely hot 42°C (107.6°F). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.Heat index data is primarily for areas with shade and subjected to light winds. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', quantifies the warmth felt when relative humidity is considered. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.
Humidity
In September, the average relative humidity is 79%.Rainfall
In September, the rain falls for 23.1 days. Throughout September, 106mm (4.17") of precipitation is accumulated. Throughout the year, there are 265.1 rainfall days, and 806mm (31.73") of precipitation is accumulated.Daylight
In Castleton, the average length of the day in September is 12h and 14min.On the first day of September, sunrise is at 05:52 and sunset at 18:21. On the last day of the month, sunrise is at 05:57 and sunset at 17:56 EST.
Sunshine
In September, the average sunshine is 10.9h.UV index
The months with the lowest UV index in Castleton are January through April, September, November and December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 6 during September leads to these instructions:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Castleton, Jamaica
- Average high temperature in September: 31.4°C
The warmest months (with the highest average high temperature) are July and August (31.7°C).
The month with the lowest average high temperature is January (28.4°C).
- Average low temperature in September: 23.3°C
The month with the highest average low temperature is August (23.8°C).
The coldest month (with the lowest average low temperature) is January (20.5°C).
Average pressure in September
Castleton, Jamaica
- Average pressure in September: 1012.3mbar
The month with the highest atmospheric pressure is January (1015.5mbar).
The month with the lowest atmospheric pressure is October (1011.5mbar).
Average wind speed in September
Castleton, Jamaica
- Average wind speed in September: 6.8km/h
The windiest month (with the highest average wind speed) is June (9km/h).
The calmest month (with the lowest average wind speed) is November (6.6km/h).
Average humidity in September
Castleton, Jamaica
- Average humidity in September: 79%
The months with the highest relative humidity are October, November and December (81%).
The months with the lowest relative humidity are March, July and August (77%).
Average rainfall in September
Castleton, Jamaica
- Average rainfall in September: 106mm
The wettest month (with the highest rainfall) is October (123mm).
The driest month (with the least rainfall) is January (26mm).
Average rainfall days in September
Castleton, Jamaica
- Average rainfall days in September: 23.1 days
The month with the highest number of rainy days is October (26.5 days).
The month with the least rainy days is February (19.2 days).
Average daylight in September /
Average sunshine in September
Castleton, Jamaica
- Average daylight in September: 12h and 12min
The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 6min).
- Average sunshine in September: 10h and 54min
The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in September
Castleton, Jamaica
- Average sunshine days in September: 1.7 days
The month with the most sunshine days is January (6 days).
The month with the least sunshine days is October (1.5 days).
Average UV index in September
Castleton, Jamaica
- Average UV index in September: 6
The months with the highest UV index are May, June, July, August and October (UV index 7).
The months with the lowest UV index are January, February, March, April, September, November and December (UV index 6).
Average cloud cover in September
Castleton, Jamaica
- Average cloud cover in September: 29
The month with the most cloud cover is June (Cloud cover 38).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in September
Castleton, Jamaica
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
